STIMULATED BRILLOUIN-SCATTERING AND PONDEROMOTIVE SELF-FOCUSING FROM A SINGLE LASER HOT-SPOT

被引：25

作者：

ELISEEV, VV ^{[1
]}

ROZMUS, W ^{[1
]}

TIKHONCHUK, VT ^{[1
]}

CAPJACK, CE ^{[1
]}

机构：

[1] UNIV ALBERTA, DEPT ELECT ENGN, EDMONTON, AB T6G 2G7, CANADA

来源：

PHYSICS OF PLASMAS | 1995年 / 2卷 / 05期

关键词：

D O I：

10.1063/1.871319

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The parametric interaction of a focused Gaussian laser beam with ion plasma modes has been studied by using two dimensional nonparaxial spectral code [Phys. Fluids B 5, 3748 (1993)]. It is shown that the reflectivity of stimulated Brillouin scattering (SBS) from the single laser hot spot is dominated by backscattering. The reflectivity scales with the stationary gain coefficient and very closely follows predictions of a simple three wave coupling model. This is in spite of essentially nonlinear SBS behavior, which develops in the inhomogeneous density channels formed by the ponderomotive force of the beam, where it competes with the self-focusing instability (SFI). For the relatively short focal lengths (f/number<10) the SFI is diffraction limited and evolves until hot spot is focused to a size of few laser wavelengths. The SFI is responsible for the broad and anisotropic angular distribution of the transmitted light. © 1995 American Institute of Physics.

引用

页码：1712 / 1724

页数：13

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